Portable filing, milling, and grinding machine



Oct. 7, 1952 PATZAK I PORTABLE FILING, MILLING, AND GRINDING MACHINEFiled Dec. 18, 1947 2 SHEETSSHEET l I v I Oct. 7, 1952 K. PATZAK2,612,784

PORTABLE FILING, MILLING, AND GRINDING MACHINE Filed D80. 18, 1947 I 2SHEETS-SHEET 2 //IIIIIIIIIIIIIIIIIIIIIIJ71 \MIIIIIIIIIIIIHH llllllllllHIllll lll l l lllllll IG'. 2

Patented Oct. 7, 1952 Y I t .'-,2,612,784 V Y I Pdit'iingmFILINGiMILLING, AND

a GRINDING MACHINE ILKarelLBatzak )Prague,@Czechoslovakia.-Apfilica'tion December 18,1947; SerialNiiL 792,534

Ju -Czechoslovakia September- 9, 1946 I isecmnignubnc tawlsso, August S,1946 .Batentoexpires Septemberl9,w1-966 .7

The present invention :relates to a portable -filing, milling andgrinding machine "with teen- 1. tinuo'us "revolution I control and withtwo trans- I nissio n gears for attaining the highest possiblerevolutions required for grinding bygmeans. of

The hitherto known macliines' of thistype 20 "fpr'esent' a :number of'rdrawbacks. Their range :rof revolutions' is comparatively"sm'allfi'an'd does not at all' suit the i'reciuirements'fof"machiningand finishing various'materials. A stepwise variability of"revolutions'is"prejudiciousffor'the "use of all-sizes of rotary tools.In"some"cases the transmissions: invoivegearwheels"alwaysisub- Ij'ectedto rapid wear and'cau'sing" noisyfrunning. 'Moreovenall familiardesignsof machines-"of this typeareunshielded. According --to thepresent invention allthe above mentioned drawbacks -will" be-eliminatedby providing between the driving-shaftand rthe first working shaft? atransmissionwith continutous control, the most advantageous--adjustmentof the working revolutions-ofthe machine-being "achieved in" function of-the indications of.- a-scale including the kinds ofmaterialsunderrtreatment *and the respective diameters-"of therotary'm'w chiningtools. Consequently, the workerrh'aving "in frontothimithe materialto*be'-worl ed,ihas only'to' read off on"'the"sca1e" thenecessary tool"diameter for carrying out the finishing operation'and by placing theindicator enthdrespective division of the scale adjusts automaticallythe machine'to the most advantageous revolutions'owingto the arrangementof a continuous control between the driving shaft and the first jworkingshaft. I I

The accompanying drawinglillustrates, merely 'fby waywof example, anembodiment of the maflchine according to thefpresentinvention. r Fig.lushowingaperspective view of ,the..generalarrangement of the machine,

Fig. 2 showing a front view of "the rna'chine The portable filing,milling and attached toIthe shaft l l ofthefina'chinef a 55 shielded bythe cover I 5.

(on. 74-'1'6) I turned by 90 and a cross section'o I-IinF ig.1,; i r

Fig, 3 showing a. longitudinal'slection son; line II--II inFig.2.I Ichine according to the invention compris 'fiexible shafts, at the ends.of .lwhi'ch the tive rotary tools'are beingattached. flexible shaft,the so-calledfilingfshaft flexible shaft, the grinding shaft 5| 1a,:i1nected to the shaft of the machinefiaiid" a third shaft, the high-speedfl xib e sh ife'zmzx i connected tothe'shaft20of theIinach 15 "Theproblemof continuousjrevo ut"; I

is solved by'the provision "of a jfr'ictiojn "mission gear between thedriving shaft of he electric motor of-"the machine' and th 'Zfiling)wo'rking shaft turning' within revolutionran'g'e. 'IhiS tranSni'ifsSicinis "by' twd'bevel rollers "4 and 10. The dr: 4 is "directly connected tothe shaft 3 'electricimotor 2 mounte'd in the' i'n chin :transm-ission'ofithe" rotaryiiforce is pe through TSP slide 1 wheel '16vcoatedivwith'i a iiuober ring 5. .Saidwheel'iis freely *isu'pportemoveable screw nut 'l" threaded -iand secured against-rotation; v-wire r@01' the '2 like. :By: :turninesaidnut"1thusvchanging:tinraecontinuouspsman- :ner therevolutionsrofsaidishatt J-| wi:ththread- I ing i 3- -whereon-: thezfiexiblelshait :tool. is .wattache'd the rangalof Elia ltween-.1000.and 38000 revs. -lper nii ut Further revolutions,, i. e. "up" 1r minuteforthenso-called grinding; attached to the'threa'ding offshaft '1"tained through :a transmission": 40'endless flat 'fabric-"belt' "ll"from unto' the pulley I8! 'ThI eI fiat-belt stretched by aspiral spring9; I

In'the sameinanner'tlie fui' the tr 'for the highjspeed flexible sham:Uni-attached? to .thlthlfid'diligSOfi said shatti2 Iris designed. iSaidyflexible shaft is fprov'ided "for? thessmall'estw grinding discs from55mm.- up to ,20 mm". in l-dia -;and '3turning-:atbetween:24,000;andgi8 0Said highspeedr shaits l1 a n't in needlesbearings, ball bearing orlthese-=-transmission gears a e? ois'elessaa di he entireconstructionis. shieldedjthronghont The t-main portion ofl themachineh lenc sed a--two-I-part.-casing v. the; transrriissionQg'ear On said casing l aswitch 2] is provided with the inlet cable 22. The whole machine mayrest on either a low or a high stand (see Fig. 1) and is turnable.

Fig. :1 illustrates also the arrangement of a handy scale 24 withindicator 29 extending inside the casing up to said slidable nut 1 ofsaid transmission friction gear 6. Said scale includes all the types ofmaterial for the machining of which this machine is intended and inconformity with the properties of these materials, such as theirstrength, hardness etc. the required diameters of the respective rotarytools for machining said materials are calculated. These data aregrouped in the individual lines of said table scale so that the workerby placing correspondingly the indicator may, without any necessity ofcalculating adjust through said wheel 9 the most advantageousrevolutions, if

he knows the material being machined and the diameter of the requiredrotary tool.

Iclaim: 1. A portable drive unit for drivingshafts bearing tools formaking an article, comprising in combination, a casing; an electricmotor arranged in said casing and having a motor shaft arranged in saidcasing; a bevelled roller secured to said motor shaft; a first toolbearing shaft rotatably arranged in said casing parallel to said motorshaft; a bevelled roller secured to said first tool bearing shaft andhaving a slope being equal and opposite to the slope of said bevelledroller secured to said motor shaft so as to leave a space having-aconstant width between said bevelled rollers; a bolt supported by saidcasing in the central line of the space between said bevelled -,rollers;a slide wheel arranged on said bolt and -.engaging said bevelled rollersso as to transfer ..-the rotation from said motor shaft to said firsttool bearing shaft; means for shifting said slide wheel along said boltso as to vary the gear ratio between said motor shaft and said firsttool bearing shaft; a second tool bearing shaft ro- ,tatably arranged insaid casing; and means arranged in said casing for driving said secondtool bearing shaft by said first tool bearing shaft at a constant highspeed ratio.

, Aportable drive unit for driving shafts bearing tools for making anarticle, comprising in combination, a casing; an electric motor ar- 1'ranged in said casing and having a motor shaft arranged in said casing;a bevelled roller secured 'to said motor shaft; a first tool bearingshaft 1 rotatably arranged in said casing parallel to said motor shaft;a bevelled roller secured to said first toolbearing shaft and having aslope being equal and opposite to the slope of said bevelled rollersecured to said motor shaft so as to leave a spacehaving a constantwidth between said bevelled rollers; a bolt supported by said casing inthe central line of the space between said bevelled rollers; a slidewheel arranged on said bolt and engaging said bevelled rollers so as totransfer the rotationv from said motor shaft to said first tool bearingshaft; means for shifting said slide wheelalong said bolt so as to varythe gear ratio between said motor shaft and said first tool'bearingshaft; a second tool bearing shaft rotatably, arranged in said casing;means arranged in said casing for driving said second tool bearing shaftby said first tool bearing shaft at a constant high speed ratio; a thirdtool bearing shaft rotatably arranged in said casing; and

means arranged in said casing for driving said in combination, a casing;an electric motor arranged in said casing and having a motor shaftarranged in said casing; a bevelled roller secured to said motor shaft;a first tool bearing shaft rotatably arranged in said casing parallel tosaid motor shaft; a bevelled roller secured to said first tool bearingshaft and having a slope being equal and opposite to the slope of saidbevelled roller secured to said motor shaft so as to leave a spacehaving a, constant width between said bevelled rollers; a bolt supportedby said casing in the central line of the space between said bevelledrollers; a screw nut arranged on said bolt; means for preventing saidscrew nut from rotating with respect to said casing and allowing saidscrew nut to rotate with respect to said bolt; a slide wheel rotatablyarranged on the perimeter of said screw nut and engaging said bevelledrollers so as to transfer the rotation from said motor shaft to saidfirst tool bearing shaft; means for shifting said slide wheel along saidbolt so as to vary the gear ratio between said motor shaft and saidfirst tool bearing shaft; a second tool bearing shaft rotatably arrangedin said casing; and means arranged in said casing for driving saidsecond tool bearing shaft by said first tool bearing shaft at a constanthigh speed ratio.

' 4. A portable drive unit for driving shafts tosaid motor shaft; afirst tool bearing shaft rotatably arranged in said casing parallel tosaid motor shaft; a bevelled roller secured to said first tool bearingshaft and having a slope being equal and opposite to the slope of saidbevelled roller secured to said motor shaft so as to leave a space'having a constant width between said bevelled rollers; a bolt supportedby said casing in the central line of the space between said bevelledrollers; a screw nut arranged on said bolt; means for preventing saidscrew nut from rotating with respect to said casing and allowing saidscrew nut to rotate with respect to said bolt; a slide wheel rotatablyarranged on the perimeter of said screw nut and engaging said bevelledrollers so as to transfer the rotation from said motor shaft to saidfirst tool bearing shaft: means for rotating said bolt with respect tosaid casin so as to shift said slide wheel along said bolt so as to varythe gear ratio between said motor shaft and said first tool bearingshaft; a secondtool bearing shaft rotatably arranged in said casing: andmeans arran ed in said casing for driving said second tool bearing shaftby said first tool bearing shaft at a constant high speed ratio.

5. A portable drive unit for driving shafts bearing tools for making anarticle, comprising in combination, a casing: an electric motor arran edin said casing and having a motor shaft arranged in said casing; abevelled roller secured to said motor shaft; a first tool bearing shaftrotatably arranged in said casing parallel to said motor shaft; abevelled roller secured to said first tool bearing shaft and having aslope being canal and op osite to the slope of said bevelled rollersecured to said motor shaft so as to leave a space having a constantwidth between said bevelled rollers; a bolt supported by said casing inthe central line of the space between said bevelled rollers; a screw nutarranged on said bolt; means for preventing said screw nut from rotatingwith respect to said casing and allowing said screw nut to rotate withrespect to said bolt; a slide wheel rotatably arranged on the perimeterof said screw nut and engaging said bevelled rollers so as to transferthe rotation from said motor shaft to said first tool bearing shaft;means for rotating said bolt with respect to said casing so as to'shiftsaid slide wheel along said bolt so as to vary the gear ratio betweensaid motor shaft and said first tool bearing shaft; an indicator rigidlyconnected to said screw nut and having an extension; a scale platearranged outside said casing for cooperation with said extension of saidindicator so as to permit an ad-- ju-stment of said screw nut withrespect to said bolt thereby adjusting the gear ratio between said motorshaft and said first tool bearing shaft; a second tool bearing shaftrotatably arranged in said casing; and means arranged in said-casing fordriving said second tool bearing shaft by said first tool bearing shaftat a constant high speed ratio.

6. A portable drive unit for driving shafts hearing tools for making anarticle, comprising in combination, a casing; an electric motor arrangedin said casing and having a motor shaft arranged in said casing; abevelled roller secured to said respect to said casing and allowing saidscrew nut to rotate with respect to said bolt; a slide wheel rotatablyarranged on the perimeter of said screw nut and engaging said bevelledrollers so as to transfer the rotation from said motor shaft to saidfirst tool bearing shaft; means for rotating saidibolt with respect tosaid casing so as to shift'said slide wheel along said bolt so as tovary the-gear ratio between said motor shaft and said first tool bearingshaft; an indicator rigidly connected to said screw nut and having anextension; a scale plate arranged outside said casing for cooperationwith said extension of said indicator so as to permit an adjustment ofsaid screw nut with respect to said bolt thereby adjusting the gearratio between said motor shaft and said first tool bearing shaft; asecond tool bearing shaft rotatably arranged in said casing; meansarranged in said casing for driving said second tool bearing shaft bysaid first tool hearing shaft at a constant high speed ratio; a thirdtool bearing shaft rotatably arranged in said casing; and .meansarranged in said casing for driving said third tool bearing shaft bysaid second tool bearing shaft at a constant high speed ratio.

KAREL PATZAK.

REFERENCES CITED Thefollowing references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 125,809 Grout Apr. 16, 1872730,930 Lambert June 16, 1903 776,455 Christie Nov. 29, 1904 1,055,476Krayer Mar. 11, 1913 2,089,003 Sack Aug. 3, 1937 2,360,181 Waltz Oct.10, 1944 2,419,639 Groene Apr. 29, 1947

